Home Current Issue Previous Issues Published Ahead-of-Print For Authors Journal Info
Skip Navigation LinksHome > July 2013 - Volume 25 - Issue 3 > Diazepam Inhibits Proliferation of Human Glioblastoma Cells...
Journal of Neurosurgical Anesthesiology:
doi: 10.1097/ANA.0b013e31828bac6a
Laboratory Investigations

Diazepam Inhibits Proliferation of Human Glioblastoma Cells Through Triggering a G0/G1 Cell Cycle Arrest

Chen, Jingkao PhD*; Ouyang, Ying MSc; Cao, Lin MD; Zhu, Wenbo PhD*; Zhou, Yuxi PhD*; Zhou, Yuehan MD*; Zhang, Haipeng BSc*; Yang, Xiaoxiao MSc*; Mao, Lifang MD§; Lin, Suizhen MD; Lin, Jun MD§; Hu, Jun PhD; Yan, Guangmei MD*

Collapse Box

Abstract

Background:

Glioblastoma (GBM), the most common primary brain tumor, is the most aggressive malignancy in humans. Its rapid proliferation is a major obstacle to successful treatment. Patients with GBM often suffer from psychological disturbances associated with poor prognosis and physical discomfort. Diazepam is one of the most frequently used benzodiazepines (BZs) in cancer patients for its desirable psychotropic effects. The central effects of BZs are mediated by the activation of central BZ receptors. This study investigates whether diazepam has inhibitory effect on proliferation of GBM cell line T98G and explores its possible mechanism.

Methods:

Cell viability and proliferation were respectively determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (MTT) assay and 5-bromo-2’-deoxyuridine (BrdU) incorporation assay. Cell cycle distribution was examined by flow cytometry. Western blot with specific protein antibodies was used to detect regulatory proteins involved in cell cycle regulation.

Results:

Diazepam significantly decreased the proliferation of T98G cells in a dose-dependent and time-dependent manner. This effect was not reversed by the central BZ receptor antagonist flumazenil or the peripheral BZ receptor antagonist PK11195, indicating that it was not mediated by BZ receptors. Flow cytometry indicated that diazepam caused a cell accumulation in G0/G1 phase, thereby contributing to cell proliferation inhibition. Furthermore, our findings showed that lessened phosphorylation of Rb accounted for diazepam-induced G0/G1 phase arrest.

Conclusions:

Diazepam inhibits the proliferation of human GBM T98G cells by inducing G0/G1 phase arrest. Diazepam has potential to be a lead for new drugs in GBM therapy because of its antitumor activity.

Copyright © 2013 by Lippincott Williams & Wilkins

Login

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.